Wordsmith.org: the magic of words


A.Word.A.Day

About Us | What's New | Search | Site Map | Contact Us  


Home

Today's Word

Subscribe

Archives



Dec 30, 2014
This week’s theme
New words (relatively speaking)

This week’s words
prebuttal
captcha
crowdsource
google
anthropocene

captcha
Bookmark and Share Facebook Twitter Digg MySpace Bookmark and Share
A.Word.A.Day
with Anu Garg

captcha

PRONUNCIATION:
(KAP-chuh)

MEANING:
noun: A test used to make sure that a human, not a computer program, is using a system. The test typically involves reading distorted text.

ETYMOLOGY:
An acronym of Completely Automated Public Turing Test to tell Computers and Humans Apart. The Turing test is named after Alan Turing, a mathematician and computer scientist, who proposed that a computer could be considered intelligent if, while interacting with a human and a computer, someone could not tell which is which. A captcha is a kind of reverse Turing test. Earliest documented use: 2001.

USAGE:
“Yet here we are, watching a carrier [Ryanair] that considered charging passengers to pee, opening a Twitter account, accepting American Express credit cards, and removing its annoying Captcha.”
Pol O Conghaile; Be Travel Savvy; Irish Independent (Dublin); Oct 5, 2013.

A THOUGHT FOR TODAY:
In religion, faith is a virtue. In science, faith is a vice. -Jerry Coyne, biology professor (b. 1949)

A.Word.A.Day by email:

Subscribe

"The most welcomed, most enduring piece of daily mass e-mail in cyberspace."

The New York Times

Subscriber Services
Awards | Stats | Links | Privacy Policy
Contribute | Advertise

© 1994-2017 Wordsmith